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Borrowings - Summary of Borrowings (Detail) - EUR (€)
€ in Millions
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
 [1]
Disclosure of detailed information about borrowings [Line Items]      
Borrowings € 9,307 € 12,061 [1] € 13,635
Current 4,969 1,379  
Non-current 4,338 10,682  
Fair value of borrowings 9,783 12,421  
Capital funding [member]      
Disclosure of detailed information about borrowings [Line Items]      
Borrowings 1,745 1,774  
Operational funding [member]      
Disclosure of detailed information about borrowings [Line Items]      
Borrowings € 7,562 € 10,287  
[1] Amounts have been restated to reflect voluntary changes in accounting policies related to liability adequacy testing that was adopted by Aegon effective January 1, 2019. Refer to note 2.1.2 Voluntary changes in accounting policies for details about this change.